The gas/dust ratio in spiral galaxies

Devereux, Nick; Young, J. S.

doi:10.1086/169031

Cited by 178 publications

(199 citation statements)

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“…(4) with C = 1.27 M Jy −1 Mpc −2 , consistent with Contursi et al (2001), and a = 144 K for S λ = S 100 µm (Devereux & Young 1990). The determination of the dust to gas ratio in a way consistent with that obtained in the solar neighbourhood, requires the estimate of the gas and dust surface densities, thus of the spatial distribution of dust and gas over the discs.…”

Section: An Alternative Methodsmentioning

confidence: 60%

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Molecular gas in normal late-type galaxies

Boselli

Lequeux²,

Gavazzi³

2002

A&A

219

390

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Abstract. We present 12 CO(J = 1-0) line observations of 22 low-luminosity spiral galaxies in the Virgo cluster. These data, together with 244 others available in the literature, allow us to build a large sample that we use to study the molecular gas properties of galaxies spanning a large range of morphological types and luminosities and belonging to different environments (clusters -field). The molecular gas content of the target galaxies is estimated using a luminosity-dependent X = N(H2)/I(CO) conversion factor that has been calibrated on a sample of nearby galaxies. X spans from ∼10 20 mol cm −2 (K km s −1 ) −1 in giant spirals to ∼10 21 mol cm −2 (K km s −1 ) −1 in dwarf irregulars. The value of the X conversion factor is found consistent with a value derived independently from dust masses estimated from FIR fluxes, with a metallicity-dependent dust to gas ratio. The relationships between X and the UV radiation field (as traced by the Hα + [NII]EW), the metallicity and the H band luminosity are analysed. We show that the molecular gas contained in molecular clouds or complexes is of the order of 15% of the total gas on average whatever the luminosity or the Hubble type of the galaxies. We discuss the relation between the star formation rate and the molecular gas content and estimate the average star formation efficiency of late-type galaxies.

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Section: An Alternative Methodsmentioning

confidence: 60%

“…Recent observations aimed at determining the spectral energy distribution in the far-IR of normal, quiescent galaxies indicate that their SED can be fitted by a modified Planck law ν β B ν (T d ), with β = 2 . The total dust mass can be thus determined from the relation (Devereux & Young 1990):…”

Section: An Alternative Methodsmentioning

confidence: 99%

Molecular gas in normal late-type galaxies

Boselli

Lequeux²,

Gavazzi³

2002

A&A

219

390

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“…In the case of UGC 7321, if we make such assumptions, then we would predict a molecular gas to atomic gas ratio somewhat higher than the typical upper limits of [ found for the central regions of SdÈSdm galaxies by 40% Devereux & Young (1990). Moreover, this is considerably higher than empirical measures for UGC 7321 by Matthews & Gao (2001), which suggest that only D4% of the total gas content in the central regions of UGC 7321 is molecular (assuming a Galactic CO-to-conversion factor).…”

Section: Implications Of a Clumpy Multiphase Ism In Ugc 7321mentioning

confidence: 65%

“…where is the IRAS 100 km Ñux density in Jy (1.15 Jy for S 100 UGC 7321 ; Sage 1993), D is the distance in Mpc, is the T d dust temperature, and is a constant that depends on the c g grain opacity, and can vary by roughly a factor of 2, depending on the composition of the grains (e.g., Devereux & Young 1990 Devereux & Young (1990) found from an examination of a large sample of IRASdetected nearby galaxies, that typically only D10%È20% of the total dust mass in normal disk galaxies is warm enough to radiate in the IRAS bands (see also Greenberg & Li 1991 ;Whittet 1992). Lisenfeld & Ferrara (1998) also found for a sample of dwarf galaxies that the dust mass derived from extinction estimates is on average D29 times higher than that derived from FIR data.…”

Section: Ugc 7321 Analogs At Other Inclinationsmentioning

confidence: 99%

Modeling the Interstellar Medium of Low Surface Brightness Galaxies: Constraining Internal Extinction, Disk Color Gradients, and Intrinsic Rotation Curve Shapes

Matthews

Wood

2001

Astrophysical Journal

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We use a combination of three-dimensional Monte Carlo radiative transfer techniques and multiwavelength (BRHK, Ha) imaging data to investigate the nature of the interstellar medium (ISM) in the edge-on, low surface brightness (LSB) galaxy UGC 7321. Using realistic models that incorporate multiple scattering e †ects and clumping of the stars and the interstellar material, we explore the distribution and opacity of the interstellar material (gas]dust) and its e †ects on the observed stellar disk luminosity proÐles, color gradients, and rotation curve shape. We Ðnd that UGC 7321 contains a small but nonnegligible dusty component to its ISM, yielding a B-band optical depth from disk edge to q6 e,B D 4.0 center. A signiÐcant fraction (D50%^10%) of the interstellar material in the innermost regions of UGC 7321 appears to be contained in a clumpy medium, indicating that LSB galaxies can support a modest, multiphase ISM structure. In spite of the clear presence of dust, we conclude that the large radial optical color gradients observed in UGC 7321 and other similar LSB spiral galaxies cannot be accounted for by dust and must result primarily from signiÐcant stellar population and/or metallicity gradients. We show that realistic optical depth e †ects will have little impact on the observed rotation curves of edge-on disk galaxies and cannot explain the linear, slowly rising rotation curves seen in some edge-on LSB spirals. Projection e †ects create a far larger uncertainty in recovering the true underlying rotation curve shape of galaxies viewed at inclinations i Z 85¡.

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“…Relatively little is known about the submillimetre properties of "normal" galaxies in the local universe -IRAS detected only the 10% of dust warm enough to emit in the far-IR [2] and prior to SCUBA there existed only a handful of submillimetre flux measurements or maps. The SCUBA Local Universe Galaxy Survey (SLUGS) is the first large systematic submillimetre survey of nearby galaxies.…”

Section: Introductionmentioning

confidence: 99%

Scuba Local Universe Galaxy Survey

Vlahakis

Eales

Dunne

2004

Astrophysics and Space Science Library

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We present new results from the SCUBA Local Universe Galaxy Survey (SLUGS), the first large statistical submillimetre survey of the local Universe. Following our initial survey of a sample of 104 IRASselected galaxies we now present the results of a sample of 80 Optically-Selected galaxies. This new sample, by definition free from temperature selection effects, allows us for the first time to determine how the amount of cold dust in galaxies varies with Hubble type. We detect 6 ellipticals in the sample and find them to have dust masses in excess of 10 7 M ⊙ . We derive local submillimetre Luminosity Functions and Dust Mass Functions, both directly for the OpticallySelected SLUGS and by extrapolation from the IRAS PSCz survey, and find excellent agreement.

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The gas/dust ratio in spiral galaxies

Cited by 178 publications

References 0 publications

Molecular gas in normal late-type galaxies

Molecular gas in normal late-type galaxies

Modeling the Interstellar Medium of Low Surface Brightness Galaxies: Constraining Internal Extinction, Disk Color Gradients, and Intrinsic Rotation Curve Shapes

Scuba Local Universe Galaxy Survey

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